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- Question
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to
Options- A. the heating effect of current alone
- B. hysteresis loss alone
- C. both the heating effect of current and hysteresis loss
- D. intense sunlight at noon
- Correct Answer
- both the heating effect of current and hysteresis loss
- 1. Sound of frequency below 20 Hz is called
Options- A. audio sounds
- B. infrasonic
- C. ultrasonic
- D. supersonics Discuss
- 2. Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?
- Diffusion
- Refraction
- Internal reflection
Options- A. I, II and III
- B. I and II
- C. II and III
- D. I and III Discuss
- 3. Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
Options- A. 4.2 seconds
- B. 42 seconds
- C. 4.2 years
- D. 42 years Discuss
- 4. Radio telescopes are better than optical telescopes because
Options- A. they can detect faint galaxies which no optical telescope can
- B. they can work even in cloudy conditions
- C. they can work during the day and night
- D. All of the above Discuss
- 5. One nanometer is equal to
Options- A. 10-6m
- B. 10-8m
- C. 10-9m
- D. 10-5m Discuss
- 6. Stars appears to move from east to west because
Options- A. all stars move from east to west
- B. the earth rotates from west to east
- C. the earth rotates from east to west
- D. the background of the stars moves from west to east Discuss
- 7. An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
Options- A. 1200 m
- B. 0.33 km
- C. 3.33 km
- D. 33 km Discuss
- 8. Radiocarbon is produced in the atmosphere as a result of
Options- A. collision between fast neutrons and nitrogen nuclei present in the atmosphere
- B. action of ultraviolet light from the sun on atmospheric oxygen
- C. action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
- D. lightning discharge in atmosphere Discuss
- 9. RADAR is used for
Options- A. locating submerged submarines
- B. receiving a signals in a radio receiver
- C. locating geostationary satellites
- D. detecting and locating the position of objects such as aeroplanes Discuss
- 10. Mach number is used in connection with the speed of
Options- A. sound
- B. aircraft
- C. spacecraft
- D. ships Discuss
Physics problems
Search Results
Correct Answer: infrasonic
Correct Answer: II and III
Correct Answer: 4.2 years
Correct Answer: All of the above
Correct Answer: 10-9m
Correct Answer: the earth rotates from west to east
Correct Answer: 3.33 km
Correct Answer: collision between fast neutrons and nitrogen nuclei present in the atmosphere
Correct Answer: detecting and locating the position of objects such as aeroplanes
Correct Answer: aircraft
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